Class Action Lawsuit GM: Engine, Transmission, OnStar

Case	Powell v. General Motors LLC (consolidated 6.2L L87 V8 engine class action)
Court	U.S. District Court for the Eastern District of Michigan
Status	Pending, not accepting claims yet
Claim deadline	None announced
Estimated payout	Not announced
Proof required	Not stated
How to file	No claim form available

General Motors (GM) settlement facts, last verified October 31, 2026. Sources are listed at the end of this page.

There is no class action lawsuit GM owners can file a claim in as of October 2026. Three fights are still in court: the 6.2L L87 V8 engine case, the 8-speed and 10-speed transmission suits, and the OnStar driving data litigation. None has a settlement, a claim form, or a deadline. Older deals are closed to new claims, though a few are still sending money to people already in them. If you own one of the affected trucks or SUVs, you’re usually included automatically when a deal comes, so the real job now is keeping repair paperwork.

Money Still Moving From Closed GM Settlements

Every recent GM deal is past its claim deadline, but “closed” doesn’t always mean “finished paying.” Here’s where each one stands.

5.3L LC9 oil consumption (Siqueiros): $150 million, at least $2,149 each, for 2011 to 2014 trucks bought in California, Idaho, or North Carolina. Checks started going out December 23, 2025. Reissued checks not cashed by September 24, 2026 roll into a second pro rata payment, and the Siqueiros settlement site says only owners who cashed their first check share in it.
Oklahoma LC9 (Hampton): $24.88 million, about $815 per vehicle, mostly paid automatically.
Duramax CP4 fuel pump: a $35 million deal for 2011 to 2016 Silverado and Sierra diesels. The official fuel pump settlement site reports initial payments on March 23, 2026 and additional and residual payments on August 31, 2026. The last reimbursement form was due July 5, 2026.
Chevy Bolt EV battery: $150 million, paying $1,400 if the software was installed by December 31, 2023, or $700 if you sold it or ended a lease before the fix. Final approval came in December 2025, but class counsel says payments are on hold during a Sixth Circuit appeal. That appeal, brought by owners whose opt-outs were rejected for not being signed on paper, has no announced decision date.
Shift to Park (Jefferson and Riley): $500 plus up to $375 in repairs for some Malibu, Volt, Traverse, Blazer, and Acadia models.

Still waiting on an LC9 check? Contact the administrator before assuming it’s lost. For a sense of how slowly appeals like the Bolt one move, see how long these cases take.

Match Your Truck to the Class Action Lawsuit GM Faces

Each pending case covers one engine, gearbox, or data program, not all GM vehicles. Vehicle owners should match the symptom, not just the brand. Find the problem you actually had.

Your issue	Case	Where it stands
6.2L engine knocking, seizing, or recalled	Powell v. General Motors (Michigan)	Pending, motion to dismiss undecided
8-speed shudder or harsh shifts	Speerly and Ulrich (Michigan)	Pending, certification vacated
10-speed erratic shifts or power loss	Napa Valley G Experience (California)	Pending, filed April 2026
OnStar or Smart Driver data sold	MDL 3115 (Georgia)	Pending, most claims survived
5.3L oil burning, Bolt EV battery, shifter	Siqueiros, Hampton, Bolt, Jefferson	Settled, claims closed

Owners of other brands face the same waiting game. The Jeep cases and the Kia settlements show how differently a deal can play out once a court approves one.

L87 6.2L V8: Does the Recall Remedy Sink the Case?

That’s the question the judge has to answer, and it was still open in October 2026. About a dozen suits over the 6.2-liter V8 were consolidated before Judge Shalina D. Kumar, with a consolidated complaint filed February 26, 2026. Plaintiffs allege the L87 engine loses lubrication between the crankshaft and its bearings, causing sudden, catastrophic engine failure, lost power, or fire.

The automaker recalled 597,630 vehicles in April 2025 (National Highway Traffic Safety Administration recall 25V-274) after 28,102 field complaints. Covered: 2019 to 2024 Chevrolet Silverado 1500 and GMC Sierra 1500, plus 2021 to 2024 Tahoe, Suburban, Yukon, and Cadillac Escalade SUVs.

The recall remedy is where the money question lives. A dealer scans for trouble code P0016; with it, the engine is replaced, and without it, the truck just gets thicker 0W-40 oil. In its June 8 motion to dismiss, GM argued the recall already fixes the problem, that recalled vehicles got GM’s 10-year, 150,000-mile extended warranty, and that only about 3 percent of the engines actually failed. It blames supplier manufacturing flaws in connecting rods and crankshafts, not the design.

Why does that matter to you? If the judge accepts the “already fixed” argument, owners whose engines never failed may have little left to claim. Owners who got only the oil change and lost the engine later anyway are the pattern plaintiffs point to, and their dealer invoices are the evidence.

Why the 8-Speed Class Fell Apart, and What the 10-Speed Suit Adds

No transmission case has paid anyone yet. The biggest, Speerly v. General Motors, covers roughly 800,000 owners of 2015 to 2019 models with 8L45 or 8L90 automatics that shudder or shift harshly.

Judge David Lawson certified 26 statewide groups in 2023, and a Sixth Circuit panel agreed. Then the full Sixth Circuit, sitting en banc, vacated it on June 27, 2025. Its reason matters for your odds: one shared “defect” isn’t enough, so plaintiffs must prove each state’s own legal elements, like reliance and damages. Expect slower, state-by-state tracks. A companion suit, Ulrich, covers the other states.

The 10-speed suit, a new class action, was filed in the U.S. District Court for the Northern District of California in April 2026. It targets the 10L80 unit co-developed with Ford. The lawsuit alleges violent shifts and power loss, after recalls for units that could briefly lock the rear wheels. The proposed group is limited to California buyers for now, so owners in other states aren’t covered by it.

OnStar Smart Driver Data: Lawsuit Money vs. Government Penalties

The OnStar case is alive, but the two government deals pay drivers nothing.

Private suit: About 30 cases sit in MDL 3115 before Judge Thomas Thrash in Atlanta. Smart Driver data (braking, speeding, late-night trips) allegedly went to LexisNexis and Verisk, and insurers raised premiums. A spring 2026 ruling let over 40 claims proceed, including Wiretap Act counts. No group has been certified and no settlement exists.
FTC order: The Federal Trade Commission finalized a 20-year order on January 14, 2026, banning sales of driving data to consumer reporting agencies for five years. No refunds.
California penalty: $12.75 million paid to the state in May 2026, a record under the California Consumer Privacy Act. None goes to drivers.

If your premium jumped after you enrolled in Smart Driver, the insurer side matters too. The State Farm page covers the insurance class actions that run alongside data cases like this one.

Lemon Law and Warranty Claims Don’t Wait for the Class Case

A pending group case doesn’t block your state’s lemon law or warranty rights today. Those are separate, faster paths, and the deadlines on them keep running while the federal suits drag on. An attorney can say whether opting out of a future deal makes sense for your vehicle.

Whichever route you take, the same records win it. Qualifying buyers are usually included in a settlement automatically, as the guide to how to join a settlement explains.

Run your VIN through NHTSA’s recall lookup and get any open recall done.
Keep every dealer invoice and towing or rental receipt, since settlements usually reimburse documented costs.
Ignore sites charging a fee to “join.” Official notices never do.

Your next step: find your symptom in the table above, save your repair paperwork, and check the settlement deadlines list every few weeks. When a class action lawsuit GM is fighting finally settles, the claim window may be short, and people with receipts in hand usually collect the most.

GM Lawsuit FAQ

How much will I get from a GM class action?

Nothing yet from the engine, transmission, or OnStar cases, since none has settled. Recent deals paid about $815 in Oklahoma, at least $2,149 in the three-state LC9 case, and $700 or $1,400 per Bolt EV.

How do I join the GM transmission lawsuit?

There’s no sign-up for the 8-speed or 10-speed suits. If a court certifies a group including your vehicle, or a deal is reached, notices go out with claim steps. Law firm intake forms aren’t claim forms.

Is GM sending out settlement checks?

Yes for the LC9 engine settlements, which began paying in December 2025, and the CP4 fuel pump deal, which paid in March and August 2026. The Bolt EV battery payments are on hold while an appeal is pending.

This page summarizes public information about cases against GM. It isn’t legal advice; for your own vehicle or claim, talk to a licensed attorney.

Class Action Lawsuit GM: Engine, Transmission, and OnStar Cases